Swift provides a high-performance、Compatible with Unicode strings to achieve，It has also become a part of its own standard library。In Swift 2 middle， String Type no longer comply with CollectionType protocol，Time [cray[……]
String
Swift programming language learning time may not experience this thing，But with the depth of learning，As you read other people's code when，You will probably encounter this type NS，This time you will certainly be curious，similar String and NSString In the end where the difference? They seem to be exactly the same way! and，As by keyword，We can also easily make data transfer between both of them[……]
In the C language which，To convert type does not seem to how difficult，The learning Swift when there is confusion。
Which of them seem to remember spoken tutorial，But remember，This has found，On record：
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假定三个变量： var i:Int = 5 var f:Float = 3.3 var d:Double = 4.455 |
To convert to Double Int or Float ，It is as follows
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